Magneto



Patented Jan. 16, 1923.

UNITED STATES PATENT OFFICE.

HECTOR ANDREINO, OF LE LOCLE, SWITZERLAND, ASSIGNOR TO SOCIETY FABRIQES DES MOUTRES ZENITH SUCCESSEUR DE FABBIQUES DES MOUTRES ZENITH GEORGES FAVRE-TACOT & CIE, OF LE LOCLE, SWITZERLAND.

MAGNETO.

Application led December 9, 1920. Serial No. 429,515.

T0 all whom t may concern.'

Be it known that I, HECTOR ANnRnINo, a citizen of the Swiss Republic, and resident of Le Locle, Switzerland, have invented new and useful Improvements in Magnetos, of which the following is a full, lear, and exact specification.

The present invention relates to magnetos for internal combustion engines of the kind comprising a U-shaped magnet of the usual form, a fixed induction coil, and a rotary flux distributor having two flux conducting segments located in the space between the pole pieces of the magnet. The magneto of the present invention differs from other known magnetos of the kind above specified in that, the axis of rotation of the flux distributor being parallel to the arms of the magnet, the induction coil is carried` by a core forming part of a magnetic yoke surrounding the pole piece end of one of the arms of the magnet, and arranged in the same transverse plane perpendicular to the axis of rotation as the pole pieces of the magnet and the segments of the flux distributor. The flux distributor is so arranged that during its rotation a path for the magnetic fiux of the magnet is completed in vknown manner through the yoke by the flux -rlistrilnitor alternately in one direction and the other. The flux distributor and the magnetic yoke are arranged by the construction adopted to be conveniently laminated in the same plane perpendicular to the arms of the magnet and to the axis of rotation of the flux distributor, with the object of reducing to a minimum the reluctance of this part of the iii-agnetic circuit, and of favorably influencing the operation of the magneto. The particular arrangement of the induction coil carrying yoke allows also to easily engage the same over the magnet end.

The invention is illustrated in the accompanying drawing of which- Figure il is a view in sectional end eleva-` tion. and

Figure Q is a view in sectional side elevation of one eonstructional form of magneto embodying the invention.

Figures 3 and 4 are detail sectional views illustratingdifferent constructional forms of magnet which may be employed.

Referring now first to Figures i and 2, the stationary U-shaped permanent magnet of the magneto is indicated at l, the arms of which in the normal position of the magneto are horizontal and arranged one above the other, being provided with laminated pole pieces 5 surrounding the free ends of the arms of the magnet as shown. 1n the cylin` drical space between the pole pieces 5 are located the laminated segments .2 of the flux distributor which are mounted upon a nonmagnetic support carried by end shafts 4 which are rotatably mounted in ball bearings (not shown). The support 3 carrying the segments 2 and the end shafts 4 constitute the rotary flux distributor the axis of rotation of which is parallel to the arms of the magnet l. A fixed induction coil 6 is provided which surrounds -a core 7 forming part of a laminated yoke located in a plane perpendicular to the axis of rotation of the flux distributor, the two arms 8 of the yoke surrounding thel upper arm of the magnet l, and terminating in pole pieces 9, displaced at an angle of 90O relatively to the pole pieces 5 of the magnet. The whole structure above described is enclosed in a protective casing or cover l() which also accommodates the other usual magneto mechanism, such as the contact breaker, currentdistributor etc. not shown on the drawing.

By the rotation o f the flux distributor 2, 3, 4 a path for tbe magnetic flux from the magnet l is completed through the yoke 7, 8, 9, by the segn'ients 2 in one and the other direction alternately, and there are thus produced in the yoke 7 four reversals of flux direction for each revolution ofthe distributor 2, 3, 4.

The relative arrangement of the various elements above described permits the pole pieces 5, the segments 2, and the yoke 9, 8, 7 to be conveniently laminated in tbe same plane perpendicular to the arms of the magnet and to the axis of rotation of thc flux distributor. yThis lamination enables the reluctanceof the magnetic circuit to be reduced to a minimum and favorably intluences the operation of the magneto.

ln the construction shown in Figures l and 2. the permanent magnet l is formed in a single piece. The magnet may however, also be made in several U-shaped sections arranged laterally or vertically relative to one another as shown in the modified constructions of Figures and 4 respectively.

The pole pieces 5 may also, in order more or less easily to collect the linx i'rom the arms oit 'the magnet l, suri'ound,tliese arms on three sides, (as shown in Figures l and 2) or on all four sides (as shown in Figure or completely on three sides and partially on the fourth side (as shown in Figure 4:).

ln these and other respects the constructions above described may obviously be modified Without exceeding the scope 'oit the Vinvention.

What l claim is:

A. magneto for internal combustion engines, comprising a stationary U-shaped permanent magnet with opposite pole pieces and a lrotar); flux distributor located between the pole pieces oit said magnet, having its axis of rotation parallel to the. longitudinal axis of said magnet and being provided With flux conductino' segments for completing during rotation a path for the magnetic luX of the the .said plane. perpendicularly to the arms of the magnet and to the axis of rotation of the flux distributor, substantially as and ifor the purpose described.

ln `Witness WhereoI have hereunto signed my name this 17th day off November, 1920,`

in the 1i 1esenee of two subscribingwitnesses.

HECTOR ANDRJEINO.

Witnesses JOSEPH STTERLY, Fnis'roa SALADIM. 

